Tree climbing step



FIG. 1 is a perspective view of a tree climbing step showing my newdesign;

FIG. 2 is a side elevational view thereof;

FIG. 3 is a front elevational view thereof looking from the right sideof FIG. 2; and,

FIG. 4 is a plan view looking from the top of FIG. 3.

The ornamental design for a tree climbing step, as shown and described.